Questions tagged [snubber]

A snubber is a circuit used to suppress transient voltages in electrical circuits. It can include RC snubbers that comprise a resistor and a capacitor in series, often used for AC circuits, and also a diode used across relays and other inductive components to suppress their inductive 'kickback'.

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38 views

RCD “Clamp/Snubber”

I am attempting to figure out this "RCD Snubber" as seen below: The Eval Sheet says "The resistor capacitor diode (RCD) snubber for the two synchronous rectifiers consists of R3, C29, and D4 for one ...
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112 views

Universal Relay Snubber Circuit

I am trying to design the usual remote-controlled relay board for mains usage (I live in Europe, so that means 230VAC). I need to tackle the usual problem of the switching of the relays hanging/...
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249 views

Design R C snubber for flyback converter

I have a DC/DC flyback converter and I need to design a snubber. I already know the diode to use I just need to design the R and C value. Now, I have simulated my circuit and tweaking values on C and ...
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29 views

Adding an LED through a FET circuit that currently drives a solenoid

I would like to save space on a layout by consolidating a FET or two, where feasible, on an existing board. One of the FETs used, a coolMOS P7 series (IPA60R280P7SXKSA1), seems to have the drain ...
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46 views

HV capacitor switch

I have in hand a 220V:600V isolated transformer and a HV bridge rectifier and I'd like to charge a 250uF capacitor with adjustable voltage from 200V to 500V. My idea is to use a switch between the ...
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85 views

Using snubber diodes for DC motor and relay

I code in Arduino and build stuff but don't have engineering background and get lost when trying to figure out datasheets. Already spent few hours on these and just looking for specific advice on ...
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50 views

Snubber circuit to protect SCR/Diode

In my circuit I need to discharge a capacitor into an inductive load using SCR. In order to make the circuit oscillate there'll be a diode antiparallel with the SCR, as you can see in the picture. My ...
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22 views

125vdc Snubber Circuit for Relay Contacts - 125vdc, 3.2amp load

Does anyone know of a manufacturer that makes a prebuilt "ready-to-go" Off-the-shelf snubber circuit / Arc Suppressor that can be used to protect the contacts of my dinrail-mounted relay. My load ...
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252 views

Triac Switch Circuit using MOC3021 and BT136

I am tinkering with BT136 & MOC3021 optocoupler to control AC loads, and below is the schematic i have put together. I have a few doubts here. Is the value of 100 ohm 1 watt correct on pin 6 of ...
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38 views

Is it needed a relay snubber in an ammeter?

I'm designing a picoammeter for an academic project, with different current ranges. To switch between current ranges I should use some relay, driven by a micro. This kind of ammeter should be able to ...
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316 views

Current spikes when MOSFET turns on and voltage spikes when MOSFET turns off

I studying for my Power Electronics course and have come across something which I can't seem to wrap my head around. In a lab, we built a buck converter with an inductive load and measured various ...
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17 views

Relay for rollershutter motor

A few years ago, I build a controller for our garden door rollershutters (2x 2m wide), 230VAC 2xL-N controlled. In some initial tests, the inductive load killed the cheap mechanical relays found on ...
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40 views

fan speed regulation causes other loads flickkering

I am using traic based dimmer circuit for regulating my ceiling fan. when the fan is regulated to low speed the other loads(incandescent,tube light,LED) in the room are flickering. when i increase the ...
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122 views

How can I get rid of this distortion?

I'm trying to build a 16kHz single phase, full bridge PWM inverter, Vdc=380V, 2kVA rated. When I load the inverter a little bit, the output voltage waveform is looks like this: simulate this circuit ...
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192 views

Help for TRIAC strange behavior

I try to rebuild an electronic board for an old potter's wheel. I try to build a "Phase Angle Control" with BTA16-800BWRG and MOC3043SR2M to control motor speed (the old board seem to use this ...
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72 views

BT137 triac turns-on uncommanded

I am working with the following circuit, which is from the MOC3043M datasheet with a BT137 at the location of the unnamed triac: This circuit works fine for me if I leave the snubber out. However, ...
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76 views

Battery current charging measurment

I am looking for circuits used to measure or monitor the current charging of a battery (Li-Ion or NiMH), microchip has proposed the following circuit: My concerne is about the selected circuit in RED ...
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60 views

Snubber capacitor Voltage rating

I am designing a switching circuit for celing fan (max 80W/230VAC). This is basically relay based switching. I planned to add snubber circuit to reduce the back emf. I got a resistor value of 100&...
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529 views

Designing a AC Snubber circuit for 2 hp using AC snubber

I am trying to control my 2 hp 240AC single phase motor with help of an arduino. Right now it is controlled via a contactor with 220-240 AC coil input voltage with help of NO and NC switches. ...
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48 views

Electro-mechanical relay durability curve

For general-purpose electro-mechanical relays, it is often mentioned in datasheets the number of cycles under various categories of load (AC1, AC15, DC1, DC13 etc.). For example, the following image: ...
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37 views

is it necessary add snubber network for a SSR made by mosfets?

I am designing a control circuit for AC/DC loads. To achieve this, I am using a SSR made by mosfets https://datasheet.lcsc.com/szlcsc/Vishay-Intertech-LH1546AEF_C142599.pdf However this is not a ...
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78 views

RC Snubber For Phase Angle Controller

I have a phase regulator and I'm using it for regulating the RPM of a fan - centrifugal blower. The motor is a shaded pole induction motor (220VAC, 28W). The regulator is working fine, but if the RC ...
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302 views

Can a flyback diode work on the “ground” side of a transistor?

In every flyback diode setup I see, the relay coils are on the drain side of the transistor (if my terminology is wrong, I mean the top), so the flyback diode sends current back toward the power ...
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130 views

Power electronics DC DC converter question: What is the function of the capacitor and resistor connected between two series inductors?

This is a power electronics DC DC converter question: What is the function of the capacitor and resistor connected between two series inductors? This is part of the schematic from a photovoltaic ...
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77 views

RC Snubber for synchronous MOSFET (SMPS)

I am trying to understand the theory of RC snubber for synchronous buck converters. Some statements seem to be contradictory to me in the below mentioned application notes: “The snubber capacitance ...
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194 views

Current-to-voltage opamp in DAC application: snubber network between inputs

In transimpedance (or current-to-voltage) opamp application for DAC, it is reccomended to put at the opamp inputs a capacitor (together with a snubber RC network through the feedback resistor), in ...
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979 views

Snubber for Relay Contact Switching Resistive Load

I am working on a redesign of some circuit boards and am looking for a way to save space and potentially switch to surface mount parts. Some of the largest through hole parts in use are for an RC ...
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192 views

Protecting malfunctions in relays which operate roller shutters (motor, inductive load)

I have a circuit used to control roller shutters in my home, which roughly can be seen in the schematic below. simulate this circuit – Schematic created using CircuitLab It works, but after ...
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2k views

How to connect snubber across the relay?

How can a snubber circuit be connected across a relay? Because when we connect a snubber across the relay then the capacitor always allows the current to flow through it. The relay I am using is 12V ...
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25 views

Snubber maximum ratings

I'm developing a home automation system, and using a triac to power on/off some lights. My problem is that lights from other rooms when switched on/off are producing noise/spikes and flashing the ...
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57 views

Snubber capacitor VAC handling by frequency of C0G?

I'm looking for a suitable snubber capacitor (220 pf) for a boost converter. The semiconductor manufacturer recommends some ceramic capacitors for this http://www.mouser.com/ds/2/212/...
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2k views

How do you calculate RC snubber values for a discrete bridge rectifier

I'm working on a small linear power supply for an audio amplifier (home/hobby use) and I want to add an RC snubber on the rectifier diodes. I know this might be overkill, but I'm looking at it as an ...
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357 views

Operating a 24VAC solenoid with a Triac. Protecting with TVS DIODE, RC Snubber or both?

As part of a project I am controlling 24VAC solenoid sprinkler valves like this https://rayshobby.net/wordpress/understanding-24vac-sprinkler-valves/ using a triac (BT1308W) http://www.mouser.com/ds/2/...
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829 views

RC snubber placement

I would like to ask you about a problem that I have been experiencing recently. I am using a contactor to safely disconnect a hybrid motor starter. The starter is designed to, when tripped with its ...
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231 views

Questions on snubber circuit

I have this piece of circuitry that is supposed to protect a thyristor from spikes. Is not clear to me how it is working and if the values suggested are ok. The thyristor is a TIC106D The trigger ...
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70 views

pmp6712 active buck snubber operation

I need to design a clamp circuit in order to clamp the ringing voltage of a square wave. Therefore, I am planning to use the circuit given below. This circuit belongs to TI however, I couldn't get any ...
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46 views

Digital Counter signal oscillation

I've a digital counter (Kubler Codix 908) with integrated 30Hz interference input filter integrated, but sometimes (when the contact that will increment the counter is closed) it counts two pieces... ...
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237 views

Do ferrite beads need snubbing diodes?

Inductors, when applied as inline power filters, need a parallel snubbing diode so that when the load opens, the current can be safely discharged. In certain contexts, ferrite beads such as the Laird ...
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998 views

Zener snubber analysis

Lets imagine a Forward/Flyback converter with a zener snubber. How to analyse how this DZ snubber works? My problem is that how can I know what is the voltage of the common node of the two diodes? ...
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182 views

Snubber Network Over a Switch

I'm a newbie to electronics even though I have been working on them for a few years in mostly a hobbyist setting. I'm posting here for the first time so please be gentle. The problem I'm having with ...
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357 views

Designing flyback converter - DZ snubber

In many examples for DZ snubber zener voltage is calculated from maximum MOSFET rating and some arbitrary choosen voltage leakage (usually a percentage of Vin). They don't even use leakage inductance (...
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3k views

Is this snubber needed for MOSFET?

I met this kind of snubber network in Switchmode Power Supply Handbook (by Keith Billings and Taylor Morey): They were using it with BJTs, and the reason was to limit dv/dt to avoid secondary ...
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288 views

Snubber on the line or just the inductor

A document on the public internet, yet apparently covered by NDA, makes a surprising claim about snubbers. vendor link or archive.org Page 12 shows a device powering and switching an inductive DC ...
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109 views

RC snubber on Mosfet (smps) max C

I am designing a SMPS from TI http://www.ti.com/lit/df/tidrgc2/tidrgc2.pdf We replaced the Mosfet fro schematic with STL11N65M5 that has a Coss of 18pf So I am designing a RC snubber across it and I ...
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140 views

Electromechanical or Solid State Relay Low Duty Cycle 1/2 HP Motor

i'm hoping someone can help me decide the best relay (in my scenario) for controlling a 1/2hp inductive load from 110-120v motor. I've spent numerous days researching this and hoping someone with more ...
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413 views

Problems snubbing HF noise on flyback converter transistor

I am working on the design of a flyback converter based on the LT3751 capacitor charging circuit. My design is similar to the 42 A cap charger example on pg. 25 of the LT3751 datasheet. In my case, ...
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96 views

Thermal regulator on DS18B20 and ATtiny2313A

I'm working on a thermal regulator for a greenhouse. My device will use ATtiny2313A as uC and DS18B20 as thermal sensor. I also use 1602 LCD display to monitor current temperature and set low and high ...
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149 views

Design and simulation of snubber and hysteresis current control

I want to do an hysteresis current control with this circuit: that have three operation modes: in order to make the output current to follow a triangle wave as reference. I made a simple C code to ...
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3k views

Selecting Flyback Diode for Inductive Load

I intend to run a 48V DC water pump which uses this motor (http://www.leeson.com/leeson/searchproduct.do?invoke=viewProductDetails&motorNo=098382.00&productType=0) through a solid-state relay ...
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443 views

RC snubber across mosfet or diode with ferrite bead [closed]

I already designed a RC snubber across a mosfet and diode successfully . Reading through some whitepapers , I have seen the addition of a ferrite bead in series with RC snubber. Do you recommend it ...